/*
 * Copyright (C) 2005-2008 Alfresco Software Limited.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

 * As a special exception to the terms and conditions of version 2.0 of
 * the GPL, you may redistribute this Program in connection with Free/Libre
 * and Open Source Software ("FLOSS") applications as described in Alfresco's
 * FLOSS exception.  You should have recieved a copy of the text describing
 * the FLOSS exception, and it is also available here:
 * http://www.alfresco.com/legal/licensing"
 */
package org.alfresco.repo.version;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.alfresco.model.ContentModel;
import org.alfresco.repo.version.common.VersionUtil;
import org.alfresco.service.cmr.repository.AssociationRef;
import org.alfresco.service.cmr.repository.ChildAssociationRef;
import org.alfresco.service.cmr.repository.InvalidNodeRefException;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.cmr.repository.StoreRef;
import org.alfresco.service.namespace.QName;
import org.alfresco.service.namespace.QNamePattern;


/**
 * The version2 store node service implementation
 */
public class Node2ServiceImpl extends NodeServiceImpl implements NodeService, Version2Model
{
    /**
     * The name of the spoofed root association
     */
    private static final QName rootAssocName = QName.createQName(Version2Model.NAMESPACE_URI, "versionedState");


    /**
     * Type translation for version store
     */
    public QName getType(NodeRef nodeRef) throws InvalidNodeRefException
    {
        if (nodeRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getType(nodeRef);
        }
        
    	// frozen node type -> replaced by actual node type of the version node
    	return (QName)this.dbNodeService.getType(VersionUtil.convertNodeRef(nodeRef));
    }

    /**
     * Translation for version store
     */
    public Set<QName> getAspects(NodeRef nodeRef) throws InvalidNodeRefException
    {
        if (nodeRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getAspects(nodeRef);
        }
        
        Set<QName> aspects = this.dbNodeService.getAspects(VersionUtil.convertNodeRef(nodeRef));
        aspects.remove(Version2Model.ASPECT_VERSION);
        return aspects;
    }

    /**
     * Property translation for version store
     */
    public Map<QName, Serializable> getProperties(NodeRef nodeRef) throws InvalidNodeRefException
    {
        if (nodeRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getProperties(nodeRef);
        }
        
    	Map<QName, Serializable> props = dbNodeService.getProperties(VersionUtil.convertNodeRef(nodeRef));
    	VersionUtil.convertFrozenToOriginalProps(props);

    	return props;
    }

    /**
     * Property translation for version store
     */
    public Serializable getProperty(NodeRef nodeRef, QName qname) throws InvalidNodeRefException
    {
        if (nodeRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getProperty(nodeRef, qname);
        }
        
        // TODO optimise - get property directly and convert if needed
        Map<QName, Serializable> properties = getProperties(VersionUtil.convertNodeRef(nodeRef));
        return properties.get(qname);
    }

    /**
     * The node will apprear to be attached to the root of the version store
     *
     * @see NodeService#getParentAssocs(NodeRef, QNamePattern, QNamePattern)
     */
    public List<ChildAssociationRef> getParentAssocs(NodeRef nodeRef, QNamePattern typeQNamePattern, QNamePattern qnamePattern)
    {
        if (nodeRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getParentAssocs(nodeRef, typeQNamePattern, qnamePattern);
        }
        
        List<ChildAssociationRef> result = new ArrayList<ChildAssociationRef>();
        if (qnamePattern.isMatch(rootAssocName) == true)
        {
            result.add(new ChildAssociationRef(
                    ContentModel.ASSOC_CHILDREN,
                    dbNodeService.getRootNode(new StoreRef(StoreRef.PROTOCOL_WORKSPACE, Version2Model.STORE_ID)),
                    rootAssocName,
                    nodeRef));
        }
        return result;
    }

    /**
     * Performs conversion from version store properties to <i>real</i> associations
     */
    public List<ChildAssociationRef> getChildAssocs(NodeRef nodeRef, QNamePattern typeQNamePattern, QNamePattern qnamePattern) throws InvalidNodeRefException
    {
        if (nodeRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getChildAssocs(nodeRef, typeQNamePattern, qnamePattern);
        }
    	
        // Get the child assocs from the version store
        List<ChildAssociationRef> childAssocRefs = this.dbNodeService.getChildAssocs(
                VersionUtil.convertNodeRef(nodeRef),
                typeQNamePattern, qnamePattern);
        List<ChildAssociationRef> result = new ArrayList<ChildAssociationRef>(childAssocRefs.size());
        for (ChildAssociationRef childAssocRef : childAssocRefs)
        {
            // Get the child reference
            NodeRef childRef = childAssocRef.getChildRef();
            NodeRef referencedNode = (NodeRef)this.dbNodeService.getProperty(childRef, ContentModel.PROP_REFERENCE);

            // Build a child assoc ref to add to the returned list
            ChildAssociationRef newChildAssocRef = new ChildAssociationRef(
            		childAssocRef.getTypeQName(),
            		childAssocRef.getParentRef(),
                    childAssocRef.getQName(),
                    referencedNode,
                    childAssocRef.isPrimary(),
                    childAssocRef.getNthSibling());
            result.add(newChildAssocRef);
        }

        // sort the results so that the order appears to be exactly as it was originally
        Collections.sort(result);
 
        return result;
    }

    /**
     * Simulates the node begin attached to the root node of the version store.
     */
    public ChildAssociationRef getPrimaryParent(NodeRef nodeRef) throws InvalidNodeRefException
    {
        if (nodeRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getPrimaryParent(nodeRef);
        }
        
        return new ChildAssociationRef(
                ContentModel.ASSOC_CHILDREN,
                dbNodeService.getRootNode(new StoreRef(StoreRef.PROTOCOL_WORKSPACE, Version2Model.STORE_ID)),
                rootAssocName,
                nodeRef);
    }

    /**
     * @throws UnsupportedOperationException always
     */
    @Override
    public List<AssociationRef> getTargetAssocs(NodeRef sourceRef, QNamePattern qnamePattern)
    {
        if (sourceRef.getStoreRef().getIdentifier().equals(VersionModel.STORE_ID))
        {
            return super.getTargetAssocs(sourceRef, qnamePattern);
        }
        
        // This operation is not supported for a version2 store
        throw new UnsupportedOperationException(MSG_UNSUPPORTED);
    }
}